Initial version of node map facilities.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@281 542714f4-19e9-0310-aa3c-eee0fc999fb1
2001-08-20 22:56:55 +00:00
parent 829de84fb6
commit 67daecdf96
13 changed files with 853 additions and 0 deletions
@@ -0,0 +1,100 @@
+//
+// $Id: DirectionalLayoutManager.java,v 1.1 2001/08/20 22:56:55 shaper Exp $
+
+package com.threerings.nodemap.direction;
+
+import java.util.*;
+
+import com.threerings.nodemap.*;
+
+/**
+ * The directional layout manager lays nodes out according to the
+ * eight cardinal directions as specified in the {@link Directions}
+ * class.  The nodes must be connected with {@link DirectionalEdge}
+ * edges.
+ */
+public class DirectionalLayoutManager implements LayoutManager
+{
+    public DirectionalLayoutManager (int edgelen)
+    {
+	_edgelen = edgelen;
+	_closed = new HashMap();
+    }
+
+    public void layout (Node root, List nodes)
+    {
+	_closed.clear();
+
+	// lay out all nodes
+	layoutNode(root, 0, 0, root);
+    }
+
+    protected void layoutNode (Node root, int x, int y, Node n)
+    {
+	// consider each node only once for now
+	if (_closed.containsKey(n)) {
+	    return;
+	}
+
+	// set the node's location
+	n.setPosition(x, y);
+
+	// remember that we've placed this node
+	_closed.put(n, null);
+
+	Iterator iter = n.getEdges();
+	while (iter.hasNext()) {
+	    DirectionalEdge e = (DirectionalEdge)iter.next();
+
+	    int tx = x, ty = y;
+	    int wid = e.dst.getWidth(), hei = e.dst.getHeight();
+
+	    // shift the node in the appropriate direction
+	    switch (e.dir) {
+	    case Directions.NORTH:
+		tx -= (_edgelen + wid);
+		ty -= (_edgelen + hei);
+		break;
+
+	    case Directions.NORTHEAST:
+		ty -= (_edgelen + hei);
+		break;
+
+	    case Directions.EAST:
+		tx += (_edgelen + wid);
+		ty -= (_edgelen + hei);
+		break;
+
+	    case Directions.SOUTHEAST:
+		tx += (_edgelen + wid);
+		break;
+
+	    case Directions.SOUTH:
+		tx += (_edgelen + wid);
+		ty += (_edgelen + hei);
+		break;
+
+	    case Directions.SOUTHWEST:
+		ty += (_edgelen + hei);
+		break;
+
+	    case Directions.WEST:
+		tx -= (_edgelen + wid);
+		ty += (_edgelen + hei);
+		break;
+
+	    case Directions.NORTHWEST:
+		tx -= (_edgelen + wid);
+		break;
+	    }
+
+	    layoutNode(root, tx, ty, e.dst);
+	}
+    }
+
+    /** The length of the edges between nodes in pixels. */
+    protected int _edgelen;
+
+    /** The set of nodes already positioned. */
+    protected HashMap _closed;
+}